US5019812A - Electronic locking system - Google Patents

Electronic locking system Download PDF

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Publication number
US5019812A
US5019812A US07/036,676 US3667687A US5019812A US 5019812 A US5019812 A US 5019812A US 3667687 A US3667687 A US 3667687A US 5019812 A US5019812 A US 5019812A
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United States
Prior art keywords
key
control unit
electronic control
lock
code
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/036,676
Inventor
Anders P. Gostahagberg
Evan A. Knutsson
Mats O. G. Nystrom
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Volvo AB
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Volvo AB
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Assigned to AB VOLVO, A CORP. OF SWEDEN reassignment AB VOLVO, A CORP. OF SWEDEN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HAGBERG, ANDERS P.G., KNUTSSON, EVAN A., NYSTROM, MATS O. G.
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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00817—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys where the code of the lock can be programmed
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00785—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by light
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00817—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys where the code of the lock can be programmed
    • G07C2009/00849—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys where the code of the lock can be programmed programming by learning

Definitions

  • the subject invention concerns an electronic locking system which is intended to serve as a theft-protection device.
  • the subject invention concerns a further development of an electronic locking system of this general type.
  • the system comprises an electronic control unit as described above and a mechanical lock which may be used in the conventional manner until such a time when the user choses to tie the electronic control unit to a predetermined coded signal which may be transmitted from a transmitter means lodged in the key pertaining to the mechanical lock.
  • the electronic control unit is provided with a memory element which initially lacks information on any coded signal and which is devised in such a manner that under predetermined conditions after transmission of the coded signal of the key belonging to the lock, said memory element stores the coded signal permanently and thereafter it accepts only this coded signal in order to activate the electronic control unit.
  • FIG. 1 is a schematic illustration depicting an electronic locking system and a mechanical lock with a key.
  • FIG. 2 is a schematic illustration depicting a second embodiment of an electronic locking system and a mechanical lock with a key.
  • FIG. 1 illustrates a key 1 fitting the locking cylinder 2 of the ignition lock.
  • the key is provided with a built-in coded signal transmitter 3 with an infrared-light emitting diode 4.
  • a receiver On or adjacent the locking cylinder 2 are provided a receiver, a photo-detector 5 connected to a pre-amplifier 6.
  • a wire 7 connects the pre-amplifier 6 with an electronic unit 8 which is intended to control the engine, e.g. ignition, starting or fuel system, and which has a decoder 9 integrated therewith.
  • the key 1 is provided with two electrodes 10a for connection to two slip ring contacts 10b on the ignition lock 2.
  • a code request signal is made from the electronic control unit 8 to the code signal transmitter 3 of key 1 to transmit a number of coded signals.
  • the code is transmitted to the light-emitting diode and emitted 4 in the form of infrared signals which are received by the photo detector 5 and after amplifiction in the pre-amplifier 6 these signals are transmitted via the wire 7 to the decoder 9 in the electronic control unit 8.
  • the coded signals of the key are compared with a key code which is stored in the memory element 13 in the electronic unit 8. Upon agreement between the code of the signal received and the stored code, the electronic control unit 8 is activated and the engine of the vehicle can be started. Upon lack of agreement, the electronic control unit 8 is not activated.
  • the electronic control 8 is provided with a memory element 13 of a particular kind. Initially, no coded signal is stored in the memory. All electronic units 8 which are mounted in the motor vehicles therefore are absolutely identical originally and consequently the ignition locks may be used in the conventional manner when operated by means of their associated key.
  • the electronic unit 8 is provided with a seal in the form of disabling circuit 15. When this disabling circuit 15 is in position the memory element 13 cannot be programmed and therefore there is no theft protection. As soon as the disabling circuit 15 is broken or cut off, the key code will be stored in the memory element 13 the next time thereafter that the key and ignition lock are used, i.e. when the vehicle is started.
  • the invention presented eliminates a need to correlate the electronic control units with their specific key-lock unit, as would be necessary if they were pre-programmed. Storage of the electronic units also is facilitated because at this stage of the car production they are still universal and therefore not tied to an individual ignition lock.
  • a further advantage provided by the invention is that should the electronic unit 8 of the vehicle fail after a period of use and not function for some reason it can quite simply be replaced by a fresh universal electronic unit and only after having been mounted in the vehicle will the replacement unit be encoded and tied to the code of the ignition key belonging to this vehicle.
  • FIG. 2 shows a modification of the embodiment of FIG. 1.
  • the electrodes 10a, the slip ring contacts 10b and the wire 12 are omitted and instead a battery (now shown) is built into the key 1.
  • the battery supplies the electronic unit 8 with the current required to allow it to receive and register coded signals transmitted from the key 1.
  • the invention is not limited to use together with the ignition locks in motor vehicles.
  • the electronic locking system could advantageously be used for the ignition locks of motor cycles, motor boats or utility machines and also for instance in premises in which the doors are controlled by electronic units.

Abstract

An electronic locking system comprises a conventional mechanical lock and a key associated therewith, said key having a built-in code transmitter and receiver, preferably an infrared sensitive photo-detector which cooperates with the code transmitter. The receiver is connected to an electronic control unit which is arranged to register a coded signal emitted from the key and transmitted to the receiver. When the signal is acceptable the electronic control unit is activated. The electronic control unit is provided with a memory element contains no information on any coded signal. After transmission of the coded signal of the associated key the coded signal is stored permanently in the memory element whereafter the electronic control unit will accept only precisely this coded signal in order to be activated.

Description

BACKGROUND OF THE INVENTION
The subject invention concerns an electronic locking system which is intended to serve as a theft-protection device.
In order to prevent unauthorized persons from gaining access to premises e.g. through a locked door, increasingly ingenious mechanical locks have been devised which are considerably more difficult to force or pick than locks of earlier types.
In order to avoid the problem of having to create mechanical locks fitted with more and more sophisticated lock combinations, electronic locking devices have been developed in recent years. Such systems are intended for and are used particularly in motor cars and other vehicles. Motor cars present the problem of allowing unauthorized persons to gain access thereto comparatively easily, even when the car is fitted with very advanced door locks. In addition, in most types of cars, the ignition lock, for which one and the same key is usually used to start the motor and to open the door lock, can as a rule be forced very easily and by passed by an unauthorized person, irrespective of the construction of the lock by simply shunt connecting the electric cables. In such cases, the problem therefore is not solved even when the lock is of a non-force type.
From DE Offenlegungsschrift 30 05 890 is known an electronic locking device which is intended to be used in motor cars. The key pertaining to the motor car ignition lock is provided with a transmitter which transmits a coded signal. In addition, the motor car is fitted with an electronic unit comprising a detector designed to receive the coded signal, a decoder means and an electronic coupling means which allows the motor to be started upon registration of an authorized or valid signal.
SUMMARY OF THE INVENTION
The subject invention concerns a further development of an electronic locking system of this general type. The system comprises an electronic control unit as described above and a mechanical lock which may be used in the conventional manner until such a time when the user choses to tie the electronic control unit to a predetermined coded signal which may be transmitted from a transmitter means lodged in the key pertaining to the mechanical lock. This is achieved in accordance with the teachings of the subject invention in that the electronic control unit is provided with a memory element which initially lacks information on any coded signal and which is devised in such a manner that under predetermined conditions after transmission of the coded signal of the key belonging to the lock, said memory element stores the coded signal permanently and thereafter it accepts only this coded signal in order to activate the electronic control unit.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in closer detail in the following with reference to the embodiments illustrated in the accompanying drawings.
FIG. 1 is a schematic illustration depicting an electronic locking system and a mechanical lock with a key.
FIG. 2 is a schematic illustration depicting a second embodiment of an electronic locking system and a mechanical lock with a key.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
The embodiment which is chosen to describe the invention is the ignition lock of a motor vehicle. FIG. 1 illustrates a key 1 fitting the locking cylinder 2 of the ignition lock. The key is provided with a built-in coded signal transmitter 3 with an infrared-light emitting diode 4. On or adjacent the locking cylinder 2 are provided a receiver, a photo-detector 5 connected to a pre-amplifier 6. A wire 7 connects the pre-amplifier 6 with an electronic unit 8 which is intended to control the engine, e.g. ignition, starting or fuel system, and which has a decoder 9 integrated therewith. The key 1 is provided with two electrodes 10a for connection to two slip ring contacts 10b on the ignition lock 2.
When the key 1 is inserted into the ignition lock 2 and is turned to igniting position battery voltage is supplied to the electronic control unit 8 via a wire 11. This energizes the contacts 10b and via a wire 12 a code request signal is made from the electronic control unit 8 to the code signal transmitter 3 of key 1 to transmit a number of coded signals. The code is transmitted to the light-emitting diode and emitted 4 in the form of infrared signals which are received by the photo detector 5 and after amplifiction in the pre-amplifier 6 these signals are transmitted via the wire 7 to the decoder 9 in the electronic control unit 8. The coded signals of the key are compared with a key code which is stored in the memory element 13 in the electronic unit 8. Upon agreement between the code of the signal received and the stored code, the electronic control unit 8 is activated and the engine of the vehicle can be started. Upon lack of agreement, the electronic control unit 8 is not activated.
In accordance with the invention the electronic control 8 is provided with a memory element 13 of a particular kind. Initially, no coded signal is stored in the memory. All electronic units 8 which are mounted in the motor vehicles therefore are absolutely identical originally and consequently the ignition locks may be used in the conventional manner when operated by means of their associated key. The electronic unit 8 is provided with a seal in the form of disabling circuit 15. When this disabling circuit 15 is in position the memory element 13 cannot be programmed and therefore there is no theft protection. As soon as the disabling circuit 15 is broken or cut off, the key code will be stored in the memory element 13 the next time thereafter that the key and ignition lock are used, i.e. when the vehicle is started.
Several advantages are gained by using such general electronic units. As a rule, the manufacturer of the electronic units is not the same as the manufacturer of the ignition locks. Consequently, these components are delivered to the car manufacturing plant from different suppliers. Usually, they are also mounted into the car at different assembly stations along the car assembly line.
The invention presented eliminates a need to correlate the electronic control units with their specific key-lock unit, as would be necessary if they were pre-programmed. Storage of the electronic units also is facilitated because at this stage of the car production they are still universal and therefore not tied to an individual ignition lock.
A further advantage provided by the invention is that should the electronic unit 8 of the vehicle fail after a period of use and not function for some reason it can quite simply be replaced by a fresh universal electronic unit and only after having been mounted in the vehicle will the replacement unit be encoded and tied to the code of the ignition key belonging to this vehicle.
FIG. 2 shows a modification of the embodiment of FIG. 1. The electrodes 10a, the slip ring contacts 10b and the wire 12 are omitted and instead a battery (now shown) is built into the key 1. The battery supplies the electronic unit 8 with the current required to allow it to receive and register coded signals transmitted from the key 1.
The invention is not limited to use together with the ignition locks in motor vehicles. The electronic locking system could advantageously be used for the ignition locks of motor cycles, motor boats or utility machines and also for instance in premises in which the doors are controlled by electronic units.

Claims (4)

What we claim is:
1. An electronic locking system comprising: a conventional mechanical lock and a key for operating said lock, a code transmitter built into said key including means for transmitting coded signals in response to a code request signal when said key is used in said lock, a receiver for receiving coded signals transmitted by said code transmitter, and an electronic control unit connected to said receiver for controlling a select security function, said electronic control unit having means for transmitting code request signal to said code transmitter of said key, memory means for strong a select code signal and means for comparing a code signal received by said receiver with said stored code signal, said electronic control unit activating the select security function when said received coded signal stored therein and including seal means for preventing operation of said select security function unit said seal means has been disabled for permitting normal mechanical lock operations, disabling said seal means being effective to permit said electronic control unit to store a code signal permanently upon the first use of said key in said lock after said seal means has been disabled and when first receiving a coded signal from said receiver, said electronic control unit thereafter activating said security function only when the permanently stored code signal is received from a key used in said lock.
2. The electronic locking system as set forth in claim 1 wherein the means for activating said security function comprises means for switching an electrical circuit.
3. The electronic locking system as set forth in claim 1 comprising means in said lock and said key for transmitting electric power to said key.
4. The electronic locking system as set forth in claim 1 wherein said electronic control unit is pre-programmed to store a coded signal at a preselected occasion.
US07/036,676 1985-07-01 1986-06-27 Electronic locking system Expired - Fee Related US5019812A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8503257 1985-07-01
SE8503257A SE8503257L (en) 1985-07-01 1985-07-01 ELECTRONIC WELDING SYSTEM

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US5019812A true US5019812A (en) 1991-05-28

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US07/036,676 Expired - Fee Related US5019812A (en) 1985-07-01 1986-06-27 Electronic locking system

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US (1) US5019812A (en)
EP (1) EP0229818B1 (en)
JP (1) JPS62503179A (en)
DE (1) DE3668653D1 (en)
SE (1) SE8503257L (en)
WO (1) WO1987000234A1 (en)

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US5254842A (en) * 1990-01-08 1993-10-19 Posner Edward C System for preventing unauthorized operation of an automotive vehicle
DE4240596A1 (en) * 1992-12-03 1994-06-09 Bayerische Motoren Werke Ag Vehicle theft prevention method
US5367295A (en) * 1992-02-14 1994-11-22 Security People, Inc. Conventional mechanical lock cylinders and keys with electronic access control feature
DE4339150A1 (en) * 1993-11-18 1995-05-24 Dietrich Gebhard Vehicle security circuit e.g. for cars, motor cycles, motor boats and light aircraft
EP0658900A1 (en) * 1993-12-10 1995-06-21 Siemens Nixdorf Informationssysteme AG Lock with disk data storage
US5488195A (en) * 1994-02-18 1996-01-30 Mickel; Thattil J. Automatically actuated sound apparatus
ES2080639A1 (en) * 1992-12-31 1996-02-01 Medina Orencio Robaina Multi-code universal electronic key.
ES2080638A1 (en) * 1992-12-14 1996-02-01 Robaina Medina Orencio Universal lock.
US5513105A (en) * 1994-05-31 1996-04-30 Krones; Daniel K. Vehicle security system
DE19546350A1 (en) * 1995-01-27 1996-08-01 Honda Motor Co Ltd Anti-theft system for motor vehicle
DE19546774A1 (en) * 1995-02-08 1996-08-14 Honda Motor Co Ltd Data processing device e.g. for vehicle security system
US5610574A (en) * 1995-02-17 1997-03-11 Honda Giken Kogyo Kabushiki Kaisha Data processing apparatus for vehicle
DE19534416A1 (en) * 1995-09-16 1997-03-20 Bayerische Motoren Werke Ag Security system for motor vehicle
US5659291A (en) * 1994-11-28 1997-08-19 Ford Motor Company Key-in-ignition lock reminder system
US5679984A (en) * 1994-02-17 1997-10-21 Rover Group Limited Vehicle security system
US5742236A (en) * 1994-03-10 1998-04-21 Valeo Borge Instruments Gmbh & Co. Kg Electronic code locking mechanism, especially the deactivation of a motor drive interlock
WO1998024998A1 (en) * 1996-12-04 1998-06-11 Sun, Meng Electronic key and electronic lock
US6084531A (en) * 1995-07-05 2000-07-04 Ford Motor Company Enabling device for a motor vehicle
DE19622226C2 (en) * 1995-06-05 2001-09-13 Mitsubishi Electric Corp Device for protecting motor vehicles against unauthorized operation
DE19606624C2 (en) * 1995-03-02 2001-10-31 Mitsubishi Electric Corp Motor control device for automobiles with anti-theft function
US6331812B1 (en) * 1995-01-25 2001-12-18 Electronic Key Systems (E.K.S.) S.A.R.L. Programmable electronic locking device
US6442986B1 (en) 1998-04-07 2002-09-03 Best Lock Corporation Electronic token and lock core
US20060237522A1 (en) * 2002-01-24 2006-10-26 John Moorhouse Optical security system
US20090205384A1 (en) * 2008-02-18 2009-08-20 Sandisk Il Ltd. Electromechanical locking system
US8429095B1 (en) 1995-03-10 2013-04-23 Michael C. Ryan Fluid delivery control nozzle
US10391977B1 (en) * 2018-08-01 2019-08-27 Vanrithy Chhorn Method and a device for detecting tampering of a vehicle and notifying an owner of the vehicle

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CA1308565C (en) * 1987-01-20 1992-10-13 Ford Motor Company Of Canada, Limited Programmable key and improved lock assembly
US4980680A (en) * 1988-08-02 1990-12-25 Gte Products Corp. And Gte Laboratories, Inc. Coded surface acoustical wave (saw) motor vehicle security device
US5872721A (en) * 1990-04-11 1999-02-16 Transfresh Corporation Monitor-control systems and methods for monitoring and controlling atmospheres in containers for respiring perishables
GB2260563A (en) * 1991-07-23 1993-04-21 Robin Toms Security device
DE4201568C2 (en) * 1992-01-22 1995-12-21 Vdo Schindling Procedure for synchronization of transmitter and receiver
US5771722A (en) * 1993-11-12 1998-06-30 Kaba High Security Locks Corporation Dual control mode lock system
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US5774858A (en) * 1995-10-23 1998-06-30 Taubkin; Vladimir L. Speech analysis method of protecting a vehicle from unauthorized accessing and controlling
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Cited By (35)

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Publication number Priority date Publication date Assignee Title
US5254842A (en) * 1990-01-08 1993-10-19 Posner Edward C System for preventing unauthorized operation of an automotive vehicle
US5367295A (en) * 1992-02-14 1994-11-22 Security People, Inc. Conventional mechanical lock cylinders and keys with electronic access control feature
DE4240596A1 (en) * 1992-12-03 1994-06-09 Bayerische Motoren Werke Ag Vehicle theft prevention method
US6445282B1 (en) 1992-12-03 2002-09-03 Bayerische Motoren Werke Ag Theft prevention system for motor vehicles
ES2080638A1 (en) * 1992-12-14 1996-02-01 Robaina Medina Orencio Universal lock.
ES2080639A1 (en) * 1992-12-31 1996-02-01 Medina Orencio Robaina Multi-code universal electronic key.
DE4339150A1 (en) * 1993-11-18 1995-05-24 Dietrich Gebhard Vehicle security circuit e.g. for cars, motor cycles, motor boats and light aircraft
EP0658900A1 (en) * 1993-12-10 1995-06-21 Siemens Nixdorf Informationssysteme AG Lock with disk data storage
US5679984A (en) * 1994-02-17 1997-10-21 Rover Group Limited Vehicle security system
US5488195A (en) * 1994-02-18 1996-01-30 Mickel; Thattil J. Automatically actuated sound apparatus
US5742236A (en) * 1994-03-10 1998-04-21 Valeo Borge Instruments Gmbh & Co. Kg Electronic code locking mechanism, especially the deactivation of a motor drive interlock
US5513105A (en) * 1994-05-31 1996-04-30 Krones; Daniel K. Vehicle security system
US5659291A (en) * 1994-11-28 1997-08-19 Ford Motor Company Key-in-ignition lock reminder system
US6331812B1 (en) * 1995-01-25 2001-12-18 Electronic Key Systems (E.K.S.) S.A.R.L. Programmable electronic locking device
US5621381A (en) * 1995-01-27 1997-04-15 Honda Giken Kogyo Kabushiki Kaisha Vehicle anti-theft engine control device
DE19546350C2 (en) * 1995-01-27 2003-12-24 Honda Motor Co Ltd Anti-theft engine control device for vehicles
DE19546350A1 (en) * 1995-01-27 1996-08-01 Honda Motor Co Ltd Anti-theft system for motor vehicle
DE19546774A1 (en) * 1995-02-08 1996-08-14 Honda Motor Co Ltd Data processing device e.g. for vehicle security system
US5631501A (en) * 1995-02-08 1997-05-20 Honda Giken Kogyo Kabushiki Kaisha Data processing method and apparatus for vehicle
DE19546774B4 (en) * 1995-02-08 2007-04-05 Honda Giken Kogyo K.K. Data processing method and apparatus for vehicles
US5610574A (en) * 1995-02-17 1997-03-11 Honda Giken Kogyo Kabushiki Kaisha Data processing apparatus for vehicle
DE19606624C2 (en) * 1995-03-02 2001-10-31 Mitsubishi Electric Corp Motor control device for automobiles with anti-theft function
US8429095B1 (en) 1995-03-10 2013-04-23 Michael C. Ryan Fluid delivery control nozzle
DE19622226C2 (en) * 1995-06-05 2001-09-13 Mitsubishi Electric Corp Device for protecting motor vehicles against unauthorized operation
US6084531A (en) * 1995-07-05 2000-07-04 Ford Motor Company Enabling device for a motor vehicle
DE19534416A1 (en) * 1995-09-16 1997-03-20 Bayerische Motoren Werke Ag Security system for motor vehicle
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WO1998024998A1 (en) * 1996-12-04 1998-06-11 Sun, Meng Electronic key and electronic lock
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Also Published As

Publication number Publication date
DE3668653D1 (en) 1990-03-08
EP0229818A1 (en) 1987-07-29
JPS62503179A (en) 1987-12-17
SE8503257D0 (en) 1985-07-01
EP0229818B1 (en) 1990-01-31
WO1987000234A1 (en) 1987-01-15
SE8503257L (en) 1987-01-02

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